Window locking mechanism



May 1959 R. D. HANSEN WINDOWLOCKING MECHANISM Filed Feb. 20, 1958 INVENTOR Fad 1712170125012 ATTORNEY jam-i.

2,885,238 wrNnow Looms MECHANISM Ralph D. 'Hansen, Sioux Falls, S. Dak. Application February 20, 1958, Serial No. 716,440

claim. (crises-s1 invention relatessto. av window locking mechamsm.

The invention is more particularly concerned with a novel mechanism for locking the lower vertically movable sash of a window in lowered or closed position relative to the upper normally closed sash.

A primary object of the invention is the provision of a locking mechanism for operative disposal adjacent the lower end of the upper sash and the upper end of the lower sash of a window which is yieldably constrained to a locking position and is capable of being released by the fingers of a person when grasping the upper horizontal cross member of the lower sash in an effort to raise same.

A further object of the invention is the provision of a locking mechanism which is substantially concealed from view whereby the appearances of sash windows is substantially unimpaired in the use of the improved mechanism.

A still further object of the invention is the provision of a window sash locking mechanism which is relatively simple in construction, dependable in operation and which is capable of manufacture at relatively low cost.

Other objects and advantages of the invention will become apparent in the course of the following detailed description, taken in connection with the accompanying drawing, wherein:

Fig. l is a fragmental edge elevational view of upper and lower window sash in their closed position and wherein said sash are partially in vertical section with a view of the improved locking mechanism in side elevation.

Fig. 2 is an outer face view of a keeper plate involved in the locking mechanism.

Fig. 3 is a top plan view of a stop plate involved in the locking mechanism.

Fig. 4 is a front elevational view of a resilient locking plate involved in the locking mechanism.

Fig. 5 is a fragmental front elevational view of the upper and lower sash and wherein the positions of the locking mechanism is indicated in dotted lines.

Referring now in detail to the drawing, the improved locking mechanism is shown in operative association with the lower end of the upper sash U and the upper end of the lower sash L. In other words, the locking mechanism is disposed in the region of the opposed horizontal transverse members of the upper and lower sash.

The elements entering into the locking mechanism comprise a keeper plate (Fig. 2), a stop plate 11 (Fig. 3) and a locking plate 12 (Fig. 4).

As is indicated in Fig. 5, there is preferably a locking mechanism at each side of the window sash and the sash is modified as follows for operative association of the locking elements 10, l1 and 12.

The upper sash U is provided with a downwardly and outwardly inclined surface 13 which may be local- 2,885,238 Patented May 5, 1959 ized at the positions of the locking mechanisms or extend throughout the width of the sash.

The lower sash L is provided with a recess or pocket 14 at the location of each of the locking, mechanisms and which recesses or pockets open through the upper and inner surfaces of the sash as indicated in Fig. 1 and for a purpose later to appear. 7

As is more clearly indicated in Fig. 1, a keeper plate 10 is disposed opposite the rear open end of each of said recesses 14 and the keeper plate 10 includes a lower portion 15 which is provided with a pairof screw receiving apertures 16 and the keeper plate further includes an elongated portion 17 which is disposed at an angle to, the .-portion 15 and which terminates, in a for W d Yrmiec i flange 1.

Each keeper plate 10 is secured in position by a pair of screws 19 traversing the apertures 16 and as is indicated in Fig. 1, the portion 17 rests upon the inclined surface 13 with the flange 18 disposed horizontally and projecting inwardly from the upper sash U opposing the open inner end of a respective pocket or recess 14.

A stop plate 11 is disposed on the upper horizontal surface of the lower sash L in alignment with each of the recesses 14 and with a portion 20 thereof overhanging the outer end of the respective recess 14 and each plate 11 is provided with a pair of apertures 21 for receiving screws 22 which enter the lower sash and secure the stop plates 11 in position.

The locking plate 12 includes a lower portion 23 which is provided with a pair of screw receiving apertures 24 and which portion abuts the inner wall of lower sash L in opposition to portion 15 of plate 10 and is secured in position by means of a pair of screws 25.

The locking plate 12 is resilient or at least must be capable of yielding at a point adjacent the lower secured portion 23 and the same comprises in addition to the portion 23, a portion 26 which is disposed in angular relation to the portion 23 and which in normal position is substantially parallel to the portion 17 of plate 10.

The plate 12 further includes a generally horizontal portion 27 which is normally disposed immediately beneath portion 18 of plate 10, a further portion 28 normal to portion 27, a further elongated horizontal portion 29 which terminates in the right angularly disposed portions 30 and 31, the latter of which normally engages the under face of the overhanging portion 20 of plate 11.

The plate 12 is preferably of a width corresponding to the respective recess 14 and plates 10 and 11 are preferably of the same width.

From the above, it will be apparent that with the sash L locked relative to sash U, as in Fig. l, the sash L may be raised as in common practice by grasping the upper horizontal cross member with the fingers and in which instance corresponding fingers may be utilized to urge portions 29 of the locking plates 12 downwardly from the full line position in Fig. 1 to the dotted line position wherein the portions 27 disengage the flanges 18 with a resulting unlocking of the lower sash L. The recesses 14 provide accommodation for the portions 29, 30 and 31 and which recesses are normally closed by portions 29.

When the sash L is in elevated position, the locking plate 12 will have resumed its normal position so that upon lowering of sash L, portion 26 will be cammed outwardly by flange 18 and portion 17 will again snap under flange 18 with a relocking of the sash L.

The recesses 14 are normally closed, as indicated in Fig. 1, with a concealment of the locking mechanism.

Having set forth the invention in accordance with a preferred structural embodiment thereof, what is 3 claimed and desired to be secured by U.S. Letters Patent is:

Locking mechanism for a lower vertically slidable window sash having an upper cross member horizontally opposed to the lower cross member of an upper sash in the closed positions of the sashes, said upper sash being provided with a rigid horizontal flange projecting toward said lower sash in horizontally spaced relation thereto and below the upper surface thereof, said lower sash being provided with a recess opening through the upper and outer faces of the upper cross member thereof, a stop plate secured to the upper face of said lower sash in overhanging relation to the inner end of said recess, and a resilient locking plate comprising a lower vertical portion engaged with and secured to the outer face of said lower sash, a second portion extending upwardly from said lower portion between said cross members and being inclined away from .the upper cross member of the lower sash toward the lower ther comprising a normally horizontal portion projecting toward said lower sash and which is disposed beneath said rigid flange, in the locked position of the lower sash, said locking plate further comprising a horizontal portion extending inwardly from said first horizontal portion and terminating in a portion disposed beneath and in contact with the outer edge portion of said stop plate in the locked position of the sashes, and said stop plate and said last horizontal portion providing a substantially smooth uninterrupted upper surface for the lower sash in the closed position thereof.

References Cited in the file of this patent UNITED STATES PATENTS 2,803,476 Ivanhoe Aug. 20, 1957 

